268 



CALCIFEROUS SANDKOCK. 



Orwell, southwest corner, 

 Orwell, southwest part, 

 Orwell, Chipman's Landing, 

 Orwell, Mt. Independence, 

 Orwell, Mt. Independence, 

 Orwell, northwest of center, 

 Orwell, center, 

 Shoreham, southwest part, 

 Shoreham, southwest part, 

 Shoreham, east part, 

 Addison, near Snake Mountain, 

 Addison, Snake Mountain, 

 Panton, east part, (?) 

 Panton, west part, (?) 



East of north, 80 K., 



N.70E., 



N.7W., 



N.70E., 



About E. and W., 



About N.E.&S.W., 



10 W., A. D. H. 



10 E., A. D. II. 



25 N., C. H. H. 



5 N., C. H. II. 



4N. E., C. H. H. 



35 E., C. B. A. 



5 E., C. H. H. 



10 N. W., C. H. H. and A. D. H. 



12 X., C. H. H. 

 General dip to east, C. H. H. 



N. and S., 



15 E., 

 10 E., 

 4-5 E., 

 15 E., 



The position of the calciferous sandrock as indicated by this table, is very plain. 



Fio. 169. 



Section across West Haven, Vt. and Whitehall, N. Y. 



C. H. H. 

 C. B. A. 

 C. H. H. 

 C. H. H. and A. D. H. 



It occupies the *upper 



part of the valley of Lake Champlain, and as a part of the second concentric circle about the gneistic 

 nucleus of northern New York, it dips away from it to the east. It has been disturbed very little since its 



formation as indicated by the small inclination of its 

 beds. Sometimes there is an exceptional northerly or 

 westerly dip. The first is in consequence of a curve 

 in the whole formation ; and the latter is probably a 

 local exception. 



At West Haven this rock is found both upon the 

 east and west sides of older rocks, with an easterly dip 

 in both cases. To account for this we must suppose 

 that the older rocks upon the east have been elevated, probably since the formation of the calciferous. The 

 junction, represented by theline A, A, in Fig. 169, may be seen near the south end of West Haven. The 

 same position of the three rocks may be traced for three miles to the north. 



The older rocks at the northern extremity of the uplift gradually sink down and when out of sight are 

 covered up by the calciferous sandrock dipping east. 



Plicated rocks, supposed to be strata of calciferous sandrock, are found in the east part of Shoreham. 

 The deepest valley is at NewelTs Mill, where numerous specimens of an Euomphaloid shell may l>e 

 obtained. The strata are mostly thick-bedded, and often between them are thin sheets of argillaceous 

 matter, associated with bituminous fragments. The number of folds in this limestone even exceeds those 

 in the red sandrock series, in Monkton and Hinesburgh. 

 Range, Extent and Thickness. 



There are four different ranges of this deposit. The most extensive extends from West Haven 

 to Larrabee's Point, after which it passes into New York, and there extends with occasional interruptions 

 to Canada, along the west side of the lake. Its length in Vermont is twenty miles, and its width from 

 a few rods to three miles. Another range is in the east part of Shoreham, where it has been elevated 

 to the level of the red sandrock at least. This range is not very extensive. A longer belt of it lies 

 west of Snake Mountain, extending from the middle and south part of Addison to the north part of 

 Panton, near Vergennes. It is mostly concealed by the overlying deposits of Champlain clays. A fourth 

 locality of this rock is in the west part of Panton, where there seems to be a range a few rods wide and 

 less than a mile in length, underlying the Chazy limestone. 



Commencing at Whitehall, N. Y., we will trace the first range of calciferous sandrock as it extends north- 

 wardly, chiefly along the banks of Lake Champlain. At Whitehall this rock forms the upper part of the 

 mountain east of the village. It is found proceeding northwards, east of Poultney Kiver, and it enters 

 Vermont south of the mouth of Codman's Creek in West Haven. In the northwest part of West Haven 



* The south is the upper, and the north the lower part of Lake Champlain. 



